abstact class

Question

#include <iostream>
using namespace std;

class Enemy {
public:
virtual void attack() = 0;
};

class Ninja: public Enemy {
public:
void attack() {
cout << "Ninja!"<<endl;
}
};

class Monster: public Enemy {
public:
void attack() {
cout << "Monster!"<<endl;
}
};

int main()
{
Ninja n;
Monster m;
Enemy *e1 = &n;
Enemy *e2 = &m;

e1->attack();
e2->attack();

return 0;
}
where is abstraction please tell me friends.....please help me.

Answer 1

class Enemy {
public:

virtual void attack() {
cout << "Enemy attacks"; }
};

class Ninja : public Enemy {
public:
void attack () {
cout << "Ninja attacks"; }
};